wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
$items[75] = 5; | if (isset($items[75])) $items[75] = 5; | Check existence. | PHP |
assert temp > 42 | assert temp > 42 | Correct. | Python |
val num: Int = 'data' | val num: String = 'data' | Fix type. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
for (temp in list) | for (temp of list) | for...in iterates keys. | JavaScript |
function foo(num:string){{return num;}} foo(76); | function foo(num:string){{return num;}} foo('result'); | Pass correct type. | TypeScript |
x := 34 | x := 34 | Correct. | Go |
fn baz() -> i32 {{ 85 }} | fn baz() -> i32 {{ 85 }} | Correct. | Rust |
[3, 86, 69 | [3, 86, 69] | Close bracket. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
else
print('test') | else:
print('test') | Colon after else. | Python |
math.sqrt(58) | import math
math.sqrt(58) | Import module first. | Python |
echo test world | echo 'test world' | Quote to prevent splitting. | Shell |
$data[71] | if ($data.Count -gt 71) {{ $data[71] }} | Check bounds. | PowerShell |
$count = 35; if ($count = 35) {{}} | $count = 35; if ($count == 35) {{}} | Use ==. | PHP |
let index: Int = 'value' | let index: String = 'value' | Fix type. | Swift |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(87); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(87, () => console.log('listening')); | Add callback. | Node.js |
if ($val = 33) {{}} | if ($val -eq 33) {{}} | Use -eq. | PowerShell |
INSERT INTO items VALUES ('world',47) | INSERT INTO items (id, role) VALUES ('world',47); | Specify columns. | SQL |
let num = 100; | let num = 100; | Correct. | JavaScript |
96num = 10 | num96 = 10 | Variable cannot start with digit. | Python |
let mut z=80; let r1=&mut z; let r2=&mut z; | let mut z=80; {{ let r1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class Product {{ int bar; }}; | class Product {{ public: int bar; }}; | Make public. | C++ |
process | process() | Add parentheses. | Swift |
if num = 43 | if num == 43 | Use ==. | MATLAB |
if (b = 8) | if (b == 8) | Use ==. | C++ |
val foo: Int = 'value' | val foo: String = 'value' | Fix type. | Kotlin |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
UPDATE users SET age='world' WHERE email=6 | UPDATE users SET age='world' WHERE email=6; | Add semicolon. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
{{'status':91, 'value' 56}} | {{'status':91, 'value':56}} | Colon missing. | Python |
$data[91] = 5; | if (isset($data[91])) $data[91] = 5; | Check existence. | PHP |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let str = String::from("test"); let borrow=&str; str.push_str("!"); | let mut str = String::from("test"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
function test() {{
return
{{key:'message'}}
}} | function test() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
fn baz() -> i32 {{ 4 }} | fn baz() -> i32 {{ 4 }} | Correct. | Rust |
int items[62]; items[62]=5; | int items[62]; if(62<62){{}} else items[62]=5; | Bounds check. | C++ |
if (data = 20) {{}} | if (data == 20) {{}} | Use ==. | Kotlin |
{{"age":"output",}} | {{"age":"output"}} | Remove trailing comma. | JSON |
let str1 = String::from("message"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
items(41) | if length(items) >= 41, items(41), end | Check length. | MATLAB |
else
print('test') | else:
print('test') | Colon after else. | Python |
if index = 98 | if index == 98 | Use ==. | Go |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
list[23] | if (list.indices.contains(23)) list[23] | Check index. | Kotlin |
if result = 13 {{}} | if result == 13 {{}} | Use ==. | Swift |
h1 {{ font-size:15px color:red; }} | h1 {{ font-size:15px; color:red; }} | Add semicolon. | CSS |
num == '57' | num === 57 | Use strict equality. | JavaScript |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
{{"title":"value" "name":61}} | {{"title":"value", "name":61}} | Add comma. | JSON |
value: value
id: world, | value: value
id: world | Remove comma. | YAML |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
c = output | c = 'output' | Quote strings. | Python |
if (x = 54) {{}} | if (x === 54) {{}} | Use === for equality. | JavaScript |
if result = 52: | if result == 52: | Use == for comparison. | Python |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
function foo(result:string){{return result;}} foo(41); | function foo(result:string){{return result;}} foo('data'); | Pass correct type. | TypeScript |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
["data", 83] | ["data", 83] | Correct. | JSON |
let v=vec![96,6,37]; let primary=&v[0]; v.push(86); | let mut v=vec![96,6,37]; let primary=v[0]; v.push(86); | Copy instead of reference. | Rust |
if [ $count = 62 ]; then | if [ "$count" = 62 ]; then | Quote variable. | Shell |
def test():
print('info') | def test():
print('info') | Indent function body. | Python |
for z in range(83)
print(z) | for z in range(83):
print(z) | Colon after for. | Python |
'result' + 57 | 'result' + str(57) | Can't add int to string. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
print 'world' | print 'world'; | Add semicolon. | Perl |
const user:Person = {{name:'output'}}; | const user:Person = {{name:'output', age:1}}; | Add missing property. | TypeScript |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const y; | const y = 86; | Initialize const. | JavaScript |
if index = 72 | if index == 72 | Use ==. | Ruby |
'38' + 26 | 38 + 26 | Avoid string coercion. | JavaScript |
disp('hello') | disp('hello') | Correct. | MATLAB |
print('test') | print('test') | Correct. | R |
<note name='test'/> | <note name="test"/> | Double quotes. | XML |
function process() {{ echo 'world'; }} | function process() {{ echo 'world'; }} | Correct. | PHP |
let foo: i32 = "value"; | let foo: &str = "value"; | Type mismatch. | Rust |
def handle(bar):
return bar + 1 | def handle(bar):
return bar + 1 | Correct. | Python |
String count = 'output'; | String count = "output"; | Double quotes. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
for (int i=0; i<19; i++) {{}} | for (int i=0; i<19; i++) {{}} | Correct. | Java |
x := 51 | x := 51 | Correct. | Go |
int[] arr = new int[100];
arr[100] = 5; | int[] arr = new int[100];
if (100 < arr.length) arr[100] = 5; | Check bounds. | Java |
{{'name':'data'}} | {{"name":"data"}} | Use double quotes. | JSON |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
assert bar > 31 | assert bar > 31 | Correct. | Python |
<br></br> | <br> | Self-closing. | HTML |
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